Eastern Veil Nebula (NGC 6992)

NGC 6992 (Caldwell 33), together with NGC 6960 (Caldwell 33) and NGC 6995, is part of the Cygnus Loop, a remnant of a supernova explosion about 15'000 years ago. As the shockwave of this cosmic blast collides with interstellar material, it is ionized and is emitting light.

[from O'Meara]

This image is a combination of a deep broadband image (RGB) with long exposed narrowband data (Ha and OIII), bringing out the fine filamets of the nebulas structure.